SONY ALPHA DT 18-250 F3.5-6.3 ZOOM LENS

Special order - This item is not stocked in any of our stores. This item is available from our supplier but please order carefully, special orders are not returnable. Once your order is placed, it cannot be cancelled. Estimated delivery time is 3-4 weeks (Assuming our supplier has stock). Sorry, delivery time is subject to availability and we cannot guarantee delivery times for any special order item.Additional shipping charges may apply.

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Spherical aberration is a slight misalignment of the light rays projected on the image plane

This is caused by differences in refraction at different points on conventional spherical lenses which degrade image quality in large-aperture lenses

Specially shaped "aspherical" elements near the diaphragm restore alignment of light rays at the image plane, maintaining high sharpness and contrast even at maximum aperture and can also be used at other points in the optical path to reduce distortion

Well-designed aspherical elements can reduce the total number of elements required in the lens, thus reducing overall size and weight

Advanced Aspherical (AA) elements are an evolved variant, featuring an extremely high thickness ratio between the center and periphery

AA elements are exceedingly difficult to produce, relying on the most advanced molding technology to consistently and precisely achieve the required shape and surface accuracy, resulting in significantly improved image accuracy and quality

ED (Extra-low Dispersion) glass:

As focal lengths get longer, lenses built with conventional optical glass have difficulties with chromatic aberration, and as a result images suffer from lower contrast, lower color quality, and lower resolution

ED glass dramatically reduces chromatic aberration at telephoto ranges, and provides superior contrast across the entire image, even at large aperture settings

The distance encoder plays an integral part in ADI flash metering, which delivers high precision flash metering that is unaffected by the reflectance of subjects or backgrounds The distance encoder is a lens component that directly detects the position of the focusing mechanism, and sends a signal to the CPU in order to measure distance to the subject During flash photography, this data is very useful in calculating how much flash output is appropriate to the scene

Internal focusing:

Only the middle groups of the optical system move to achieve focus, so the overall length of the lens does not change

Other important benefits include fast autofocusing and a short minimum focusing distance

Also, the filter thread at the front of the lens does not rotate, which is convenient if you're using a polarizing filter

All prices listed are in Canadian dollars. We make every effort to ensure our prices are accurate. We do, however, reserve the right to advise you of any errors prior to processing your invoice. If you are not willing to accept changes on these errors we will cancel your order. Henry's reserves the right to limit quantities. We apologize for any inconvenience this may cause.